Unbalanced quadrature PSK modulator-limiter

Details Unbalanced quadrature PSK modulator-limiter Unbalanced quadrature PSK modulator-limiter

1988-04-12

1990-07-10

Pascal, Robert J.

Modulators

Phase shift keying modulator or quadrature amplitude modulator

375 39, 375 54, 375 67, H03C 300

Patent

active

049409549

ABSTRACT:
An unbalanced quadrature phase-shift keyed UQPSK modulator modulates two information signals onto mutually quadrature components of a carrier. If the carrier components differ from an exact quadrature relationship by an error angle, crosstalk orr distortion is introduced. The effects of such an error are ameliorated by a limiter following the modulator.

REFERENCES:
patent: 3973201 (1976-08-01), Andren
patent: 4013960 (1977-03-01), Godet
patent: 4216542 (1980-08-01), Hermesmeyer
patent: 4267591 (1981-05-01), Wissel et al.
patent: 4276521 (1981-06-01), Davidheiser
patent: 4581586 (1986-04-01), Rubin
patent: 4602227 (1986-07-01), Clark et al.
patent: 4635006 (1987-01-01), Praba
patent: 4680775 (1987-07-01), Exarque et al.
patent: 4736170 (1988-04-01), Wu et al.
"Conventional and New Applications for the Quadrature IF Microwave Mixer", by Neuf et al., Microwave Journal, Jan. 1973, pp. 99-109.
Technical Note "Modulator Highly Suppresses Carrier and Harmonics", by Torok, Microwaves, Nov. 1978, p. 96.
"Symmetrical Coupler Reduces Phase Error", by Ho et al., Microwaves, Apr. 1981, pp. 82-84.

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